The Ponte Vecchio is a medieval stone closed-spandrel segmental arch bridge over the Arno River, in Florence, Italy. It is noted for the shops built along it, as was once common. Butchers, tanners, and farmers initially occupied the shops; the present tenants are jewelers, art dealers, and souvenir sellers.
The Ponte Vecchio's two neighboring bridges are the Ponte Santa Trinita and the Ponte alle Grazie. The bridge spans the Arno at its narrowest point where it is believed that a bridge was first built in Roman times, when the via Cassia crossed the river at this point. The Roman piers were of stone, the superstructure of wood.
The bridge consists of three segmental arches: the main arch has a span of 30 meters (98 feet) the two side arches each span 27 meters (89 feet). The rise of the arches is between 3.5 and 4.4 meters (11½ to 14½ feet), and the span-to-rise ratio 5:1.
According to en.wikipedia